$\cos\left(x\right).\sin\left(x\right)=\tan\left(x\right)$
$\frac{1}{\sec\left(x\right)\tan\left(x\right)}=\csc\left(x\right)\sin\left(x\right)$
$y^3-3y^2$
$\left(a-7x\right)\left(a-7x\right)$
$\cos\left(x\right)^2\left(\tan\left(x\right)^2.1\right)$
$\frac{128}{-8}$
$-1x+12+4x=-24$
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